Sorry to nitpick, but Begum is of Bangladeshi ethnicity, her mother has a Bangladeshi passport, and that's where her father lives. Her husband is Dutch, and has been given a 6 year sentence, in his absence, by the Dutch courts. His Dutch citizenship has not been revoked. His appearance suggests his ethnicity is Asian, but his name is Yago Riedijk, a historically Dutch name. Perhaps he is mixed race. He converted to Islam so wasn't brought up in the faith, and his family appear to have lived in the Netherlands for a long time.
I would prefer she was brought back to the UK, and put on trial. Surely the intelligence service want to find out why these young people become radicalised?